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#include "test/app.hpp"
#include "src/wall-atlas.hpp"
#include "serialize/wall-atlas.hpp"
#include "serialize/json-helper.hpp"
#include "loader/loader.hpp"
#include "compat/exception.hpp"
#include <Corrade/Containers/StringStl.h>
#include <Corrade/Utility/Path.h>

namespace floormat::Wall::detail {

using nlohmann::json;

namespace {

const StringView temp_filename() {
    fm_assert(Path::exists(Path::join(loader.TEMP_PATH, "CMakeCache.txt")));
    static const auto tmp_filename = Path::join(loader.TEMP_PATH, "test/test-wall-atlas.json"_s);
    return tmp_filename;
};

StringView json_path()
{
    static const auto path = [] {
        fm_assert(Path::exists(Path::join(loader.TEMP_PATH, "CMakeCache.txt")));
        const auto path = Path::join(loader.TEMP_PATH, "test/json"_s);
        fm_assert(Path::isDirectory(path));
        return path;
    }();
    return path;
}

void test_read_header(StringView filename)
{
    const auto jroot = json_helper::from_json_(Path::join(json_path(), filename));
    auto info = read_info_header(jroot);
    fm_assert(info.name == "foo"_s);
    fm_assert(info.depth == 42);
}

void test_read_groups(StringView filename)
{
    constexpr Group group_defaults;
    const auto jroot = json_helper::from_json_(Path::join(json_path(), filename));

    auto info = read_info_header(jroot);
    fm_assert(info.name == "foo"_s);
    fm_assert(info.depth == 42);

    fm_assert(jroot["depth"] == 42);
    fm_assert( jroot.contains("n") );
    fm_assert(!jroot.contains("e") );
    fm_assert(!jroot.contains("s") );
    fm_assert( jroot.contains("w") );
    fm_assert(jroot["n"].is_object() && !jroot["n"].empty());
    fm_assert(jroot["w"].is_object() && !jroot["w"].empty());
    fm_assert(!read_direction_metadata(jroot, Direction_::N).is_empty());
    fm_assert(read_direction_metadata(jroot, Direction_::E).is_empty());
    fm_assert(read_direction_metadata(jroot, Direction_::S).is_empty());

    const auto dir = read_direction_metadata(jroot, Direction_::W);
    fm_assert(dir.passability        == pass_mode::shoot_through);
    fm_assert(dir.wall.pixel_size    == Vector2ui{}                        );
    fm_assert(dir.wall.default_tint  == false                              );
    fm_assert(dir.wall.mirrored      == group_defaults.mirrored            );
    fm_assert(dir.wall.from_rotation == (uint8_t)-1                        );
    fm_assert(dir.side.pixel_size    == Vector2ui{42, 192}                 );
    fm_assert(dir.side.default_tint  == true                               );
    fm_assert(dir.top.default_tint   == group_defaults.default_tint        );
    fm_assert(dir.overlay.tint_mult  == Vector4{0.125f, 0.25f, 0.5f, 1.f } );
    fm_assert(dir.overlay.tint_add   == Vector3{1, 2, 3}                   );
    fm_assert(dir.overlay.mirrored   == true                               );
}

[[nodiscard]] wall_atlas_def read_and_check(StringView filename)
{
    auto atlas = wall_atlas_def::deserialize(filename);

    const Info header_defaults;
    fm_assert(atlas.header.name != header_defaults.name);
    fm_assert(atlas.header.depth != header_defaults.depth);

    constexpr Frame frame_defaults;
    constexpr Group group_defaults;

    fm_assert(!atlas.frames.isEmpty());
    fm_assert(atlas.frames[0].offset != frame_defaults.offset);
    auto dir_index = atlas.direction_to_Direction_array_index[(size_t)Direction_::W];
    fm_assert(dir_index);
    const auto& dir = atlas.direction_array[dir_index.val];
    fm_assert(dir.side.pixel_size != group_defaults.pixel_size);
    fm_assert(dir.side.from_rotation == group_defaults.from_rotation);
    fm_assert(dir.corner_L.from_rotation != group_defaults.from_rotation);
    fm_assert(dir.corner_L.from_rotation == (uint8_t)Direction_::N);

    return atlas;
}

void write_to_temp_file(const wall_atlas_def& atlas)
{
    atlas.serialize(temp_filename());
}

} // namespace

} // namespace floormat::Wall::detail

void floormat::test_app::test_wall_atlas()
{
    using namespace floormat::Wall::detail;
    constexpr auto S_01_header_json = "wall-atlas-01_header.json"_s,
                   S_02_groups_json = "wall-atlas-02_groups.json"_s;

    test_read_header(S_01_header_json);

    { test_read_header(S_02_groups_json);
      test_read_groups(S_02_groups_json);
    }

    { auto a = read_and_check(Path::join(json_path(), S_02_groups_json));
      a.serialize(temp_filename());
      auto b = read_and_check(temp_filename());
      fm_assert(a == b);
    }
}